linux-kernel - Re: [PATCH v2 3/3] i2c: jz4780: Use devm_clk_get

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Message-ID: <271d9f3d-8f18-48bf-80da-2d049783e13f@vivo.com>
Date: Fri, 23 Aug 2024 10:36:54 +0800
From: Rong Qianfeng <11065417@...o.com>
To: Biju Das <biju.das.jz@...renesas.com>,
 Rong Qianfeng <rongqianfeng@...o.com>,
 Wolfram Sang <wsa+renesas@...g-engineering.com>,
 Andi Shyti <andi.shyti@...nel.org>, Paul Cercueil <paul@...pouillou.net>,
 "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
 "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>
Cc: "opensource.kernel@...o.com" <opensource.kernel@...o.com>
Subject: Re: [PATCH v2 3/3] i2c: jz4780: Use devm_clk_get_enabled() helpers


在 2024/8/22 22:21, Biju Das 写道:
> [Some people who received this message don't often get email from biju.das.jz@...renesas.com. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>
> Hi Rong Qianfeng,
>
> Thanks for the patch
>
>> -----Original Message-----
>> From: Rong Qianfeng <rongqianfeng@...o.com>
>> Sent: Thursday, August 22, 2024 3:04 PM
>> Subject: [PATCH v2 3/3] i2c: jz4780: Use devm_clk_get_enabled() helpers
>>
>> The devm_clk_get_enabled() helpers:
>>      - call devm_clk_get()
>>      - call clk_prepare_enable() and register what is needed in order to
>>       call clk_disable_unprepare() when needed, as a managed resource.
>>
>> This simplifies the code and avoids the calls to clk_disable_unprepare().
>>
>> While at it, no more special handling needed here, remove the goto label "err:".
>>
>> Signed-off-by: Rong Qianfeng <rongqianfeng@...o.com>
>> Acked-by: Paul Cercueil <paul@...pouillou.net>
>> ---
>>   drivers/i2c/busses/i2c-jz4780.c | 21 ++++++---------------
>>   1 file changed, 6 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c index
>> 4aafdfab6305..f5362c5dfb50 100644
>> --- a/drivers/i2c/busses/i2c-jz4780.c
>> +++ b/drivers/i2c/busses/i2c-jz4780.c
>> @@ -792,26 +792,22 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
>>
>>        platform_set_drvdata(pdev, i2c);
>>
>> -     i2c->clk = devm_clk_get(&pdev->dev, NULL);
>> +     i2c->clk = devm_clk_get_enabled(&pdev->dev, NULL);
>>        if (IS_ERR(i2c->clk))
>>                return PTR_ERR(i2c->clk);
>>
>> -     ret = clk_prepare_enable(i2c->clk);
>> -     if (ret)
>> -             return ret;
>> -
>>        ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
>>                                   &clk_freq);
>>        if (ret) {
>>                dev_err(&pdev->dev, "clock-frequency not specified in DT\n");
>> -             goto err;
>> +             return ret;
> Nitpick:
> Leaving it to you.
> If needed, you could send another patch to use dev_err_probe
>
> if (ret)
>          return dev_err_probe(&pdev->dev, ret, "clock-frequency not specified in DT\n");

Thanks for taking the time to review my patch! I will send another patch 
later.

>
>>        }
>>
>>        i2c->speed = clk_freq / 1000;
>>        if (i2c->speed == 0) {
>>                ret = -EINVAL;
>>                dev_err(&pdev->dev, "clock-frequency minimum is 1000\n");
>                  return dev_err_probe(&pdev->dev, -EINVAL, "clock-frequency minimum is 1000\n ");
>
> Cheers,
> Biju
>
>> -             goto err;
>> +             return ret;
>>        }
>>        jz4780_i2c_set_speed(i2c);
>>
>> @@ -827,29 +823,24 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
>>
>>        ret = platform_get_irq(pdev, 0);
>>        if (ret < 0)
>> -             goto err;
>> +             return ret;
>>        i2c->irq = ret;
>>        ret = devm_request_irq(&pdev->dev, i2c->irq, jz4780_i2c_irq, 0,
>>                               dev_name(&pdev->dev), i2c);
>>        if (ret)
>> -             goto err;
>> +             return ret;
>>
>>        ret = i2c_add_adapter(&i2c->adap);
>>        if (ret < 0)
>> -             goto err;
>> +             return ret;
>>
>>        return 0;
>> -
>> -err:
>> -     clk_disable_unprepare(i2c->clk);
>> -     return ret;
>>   }
>>
>>   static void jz4780_i2c_remove(struct platform_device *pdev)  {
>>        struct jz4780_i2c *i2c = platform_get_drvdata(pdev);
>>
>> -     clk_disable_unprepare(i2c->clk);
>>        i2c_del_adapter(&i2c->adap);
>>   }
>>
>> --
>> 2.39.0